188 Annals of the Carnegie Museum. 



angle they turn a little forward and continue across the concave space, 

 then at the lower keel they turn backward again to the columella. 



Locality. — Common in the Chazy at Crown Point, Valcour Island 

 and Chazy, New York. 



The specimens figured on Plate XLIX, figures 5 and 6, are in the 

 Yale Museum. The originals of figures 3 and 4 are in the Carnegie 

 Museum. 



Lophospira perangulata (Hall). 



(Plate XLIX, figures 7, 8.) 



Murchisonia perangulata Hall, 1847, Paleontology of New York, Vol. 



I, p. 41, PL 10, fig. 4. 



Not Murchisonia perangulata var. A, ibidem, p. 179, PL 38, figs. 

 •ja, >]b. 

 Murchisonia perangulata ? Billings, 1859, Canadian Naturalist and 



Geologist, Vol. IV, p. 458. 

 Murchisonia bicincta var. perangulata Salter, 1859, Canadian Organic 



Remains, Decade I, p. 19, PL IV, fig. 7. 

 Lophospira perangulata Ulrich and Scofield, 1897, Paleontology of 



Minnesota, Vol. Ill, part 2, p. 972, PL 63, figs. 1-7. 



This species seems to have a rather extensive geographical distribu- 

 tion. It has been found in the Chazy at Mingan Islands and on 

 Valcour Island. It was originally described from the Lowville Lime- 

 stone at Watertown, New York, and was found by Ulrich in the Stones 

 River Group of Tennessee and Kentucky, while Salter found it in the 

 Black River at Pauquettes Rapids, on the Ottawa River. 



Description. 



Shell larger than Lophospira subabbreviata, consisting of four or five 

 sharply angular whorls, the body whorl large and making up about 

 half the height of the shell. The upper surface of the whorl slopes 

 rather steeply from the suture to the periphery, and the lower surface 

 makes an angle of less than 90 ° with the upper surface. On the body 

 whorl there is below the periphery a second carina, which on some 

 specimens is only faintly indicated. The slit band is faintly shown 

 by one specimen, which is a natural cast of a mould of the exterior. 

 The surface markings are roughly indicated and seem to be the same 

 as those observed in this species when found in other formations. 



Locality. — Fairly common at Valcour Island and in the upper beds 



